Print git output when git push fails.

In the manage_projects.py script print the captured git output when git
push fails.

Change-Id: I77d8b7e926b6b23b4727a1856a79146daa9d6381
Reviewed-on: https://review.openstack.org/16137
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins
1 file changed